SC3022 is a high frequency, quasi-resonant fly-back PWM
controller (QR/DCM). The controller with x-cap discharge
function integrated high-voltage current source to provide
the current during start-up and then turns off during normal
operation. The extra low standby power consumption can
be obtained.
SC3022 provides an adaptive switching frequency foldback
to achieve higher efficiency in the whole loading range.
It operates QR and DCM with valley switching for high
efficiency. And at no load, the IC will operate in Burst mode
to reduce power consumption.
SC3022 provides functions of low start-up current, fast
start-up, low standby power consumption. The burst mode
with extremely low operation current and significantly
reduces standby power consumption to meet the efficiency
regulations.
The controller integrates a segmented power supply control
circuit, which is especially suitable for applications with a
wide output voltage range, reducing power consumption
and greatly reducing peripheral devices.
SC3022 integrated the adaptive over current protection
(AOCP), which allows controlling the maximum output
current from primary-side. The AOCP is specially designed
for USB-PD solutions, together with PD controller, such as
SC21xx serials. The AOCP can reduce the current stress of
secondary synchronous rectification.
The SC3022 offers comprehensive protection to prevent
the circuit from damage under abnormal conditions.
Furthermore, the features of frequency jittering and smart
driving function can minimize the noise and improve EMI
performance.